Alluvial-transported soil, Biology

Assignment Help:

Alluvial

Materials of this catego~ya re deposited by running water in the form offroodplains, river terraces, deltas and alluvial fans. These deposits have two outstanding characteristics by, which they can usually be recognised with ease. Fit, the individual particles tend to be rounded and smootlfed by the action of running water. Second, the layers are usually distinct in that each contain particles of a particular range or size class depending upon the speed of the transporting water. Coarse materials are laid by swift water currents, whereas, fine particles are deposited by relatively calm waters.

Alluvial soils are found bo~deringri vers and slow moving bodies of water. When first formed; these deposits are sa low that they are frequently flooded at high-water stages, and at such times they receive additional increments of fine sediment, especially if they are well vegetated. At this stage of development, they are called flood plains. As the stream cuts its channel deeper, the flood plain is left above the reach of high water and is called a terrace. Large streams are frequently bordered by a series of terraces, the oldest being at considerable heights above the present water level.

Where streams enter a lake or a sea, the deposit of silt and clay that settles down at the edge of the still water may build a delta which gradually lengthens until it extends beyond the mouth of the stream. The Sunderbans in West Bengal and Bangladesh are examples of deltas, which supprt mangrove type of vegetation. Alluvial fans are formed where a stream descends from uplands, and a sudden change in gradient may sometimes occur as the stream emerges at the lower level. Deposition of sediments is thereby forced, giving rise to alluvial fans. They differ from a delta in their location and in the character of their debris. Fan material is often gravel and stony in nature
and is well drained.

Among the transported soils, the alluvial soils of the Indoagetic Plains are highly productive and have been under'cultivation for several thousands of years. The parent material of the Indo-Gangetic alluvial soils is actually in the Himalayas. Mountain and hill washes contribute huge quaiitities of sediments brought down by the rivers and deposited in the plains below. Most of the alluvial soils are under intensive crop cultivation.


Related Discussions:- Alluvial-transported soil

Which are the structures that are part of the nervous system, Q. Which are ...

Q. Which are the structures that are part of the nervous system? The structures that form the nervous system can be divided into the peripheral nervous system (PNS) and the cen

Define characteristic of doppler echocardiographic, Q. Define characteristi...

Q. Define characteristic of Doppler Echocardiographic? Ans. Doppler findings of cardiac tarnponade are based on the following characteristic respiratory variations in intr

Describe the shape and size of proteins, Shape and size of protiens ...

Shape and size of protiens Fibrous proteins for example: keratin in hair, actin and myosin in muscles, and collagen. Globular proteins, for example enzymes and antibo

Explain the cori cycle, The  Cori cycle a)  Pyruvate formed from glucos...

The  Cori cycle a)  Pyruvate formed from glucose is converted  to lactate by lactate dehydrogenase in the muscle cell. b)  Lactate is released into  the blood and taken up b

In which area dietitians works, In which area Dietitians works Dietitia...

In which area Dietitians works Dietitians can work in a variety of areas, as already mentioned earlier, many of these are in the  Hospitals or in  the community  as  'Clinical

Why deficiency of folate take place, Why Deficiency of Folate take place? ...

Why Deficiency of Folate take place? If there is inadequate dietary folate, the activity of both the DNA and the methylation cycles, described above, will be reduced. A decrea

Aetiology, Aetiology:   A List Of The Causes Of A Disease  (Description Of ...

Aetiology:   A List Of The Causes Of A Disease  (Description Of The Characteristic Causes) Factors Which Influence The Onset Of Disease:  Include "Risk Factors", Life-Style, Sex, A

Defects in human development, Defects in Human Development 1) For inst...

Defects in Human Development 1) For instance, when a pregnant woman drinks alcohol her embryo is exposed to similar concentration of alcohol as is in her blood. The alcohol ma

New Technology, What is the best microscope to get a detailed view of the p...

What is the best microscope to get a detailed view of the parts inside of a preserved plant cell

Explain entecavir, Explain Entecavir  Entecavir  (Baraclude) taken ora...

Explain Entecavir  Entecavir  (Baraclude) taken orally once a day as monotherapy appears to be superior to lamivudine for patients with chronic HBV infection, but susceptibili

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd